<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        async function main(){
            //1. 如果返回的是非promise类型的数据  状态为成功
            // return 123;
            //2. 如果返回的是一个promise对象 状态为该promise对象的状态
            return new Promise((resolve,reject)=>{
                // resolve('ok');
                reject('error')
            })
        }

        let result = main();
        console.log(result);    
    </script>
</body>
</html>